Rotate rear element of 50/1.2 AIS?

<p>Can one rotate the rear element of a Nikkor 50/1.2 AIS? I'm asking because the cell/shroud is thinner on one side than the other (see pic), and I could use the extra clearance to mount a Dandelion 'AF' metering chip.<br>

I found this sketch <a href="http://rick_oleson.tripod.com/index-102.html">http://rick_oleson.tripod.com/index-102.html</a> , but it doesn't answer my question.</p>

<p><img src="https://lh5.googleusercontent.com/-aMo5mduTIn4/T0rZCiCIZGI/AAAAAAAAHjw/bAE9LRRdMyU/s800/D70_3-0345-50-1.2-clearance.jpg" alt="" /></p>

<p>Stefan, are you absolutely sure about the need to turn the rear element? If tooling is needed, if, then I would first try to sand something off from the inside of the Dandelion.<br>

That way you would risk only a component worth 30 €.</p>

<p>Kari, I sanded the chip down to the point where I believe I see a corner of the chip itself (the silicon) peeking through.<br>

Even if can grind a bit more away below the chip level, the room created will not be enough for the rear cell in its current orientation.</p>

<p>There are some ppl who have chipped this lens, but this involved a bit of sahving off the rear element.. not recommendable at all.</p>

<p>There is also another method, which is done by the guy's from Legacy to Digital :</p>

<p><a href="http://legacy2digital.com/nikon/2011/10/test-3.html">http://legacy2digital.com/nikon/2011/10/test-3.html</a> </p>

<p>But this is hardly a DIY method since it requires a special chip version, and specialised tools...</p>

 

<p>C.P.M., I did inquire with legacy2digital, and the 50/1.2 would run between $269 and $479. I'd rather use that money towards a newer body. With this post I was hoping for some info from people who have had this lens open -- not necessarily with the intent to chip it--, before opening it myself.<br>

Also, I haven't seen any pictures of the 'shaved' install; the fact that they modified the rear cell would seem to indicate that it can not be rotated. </p>

 

<p>Stefan, somebody in nikongear did it. That forum is currently for paid members only, but check it.<br>

And yes, somebody posted even some images in that forum. - I remember that the rear lens element was actually "tooled".<br>

Recommended only if that is what you like to do with your lens.</p>

<p>I would prefer not to mutilate the lens. Since all the other gearheads seem to be hiding behind that pay wall over there, I had to peek into my lens. See sketch linked in first post. Interestingly that screw is not a phillips but a (very small) slotted head.<br>

And unfortunately the three screws holding the rear cell are not evenly spaced, so I don't think I can easily rotate the cell. For now I left those screws alone. Here are some pics:<br>

<img src="https://lh6.googleusercontent.com/-B3rz9UuwjNA/T02Iwn_iHyI/AAAAAAAAHkY/lKJkZGljlG4/s800/D70_3-0351.jpg" alt="" /><img src="https://lh4.googleusercontent.com/-mLlQrczqBNY/T02IvMdi_yI/AAAAAAAAHkA/LS3hjnfMP1M/s800/D70_3-0353.jpg" alt="" /><img src="https://lh5.googleusercontent.com/-QmWv-DzgkxE/T02IvUHC_AI/AAAAAAAAHkE/o4um23vypCI/s800/D70_3-0354.jpg" alt="" /><img src="https://lh6.googleusercontent.com/-FN2YZZid4Ts/T02IwM_4ACI/AAAAAAAAHkQ/3LahmxFmwpg/s800/D70_3-0357.jpg" alt="" /></p>

<p>Sami Jänikselä, who had posted his 50/1.2 chipping experience to <a href="http://forums.dpreview.com/forums/readflat.asp?forum=1030&message=36768079&changemode=1">dpreview</a> , was kind enough to send me this picture showing where exactly he machined the rear element cell: <img src="https://lh6.googleusercontent.com/-Wwg0nrN-sTo/T1ZQiaCuMZI/AAAAAAAAHlQ/3Rkf90ReGbE/s800/janiksela_DSC_4928.JPG" alt="" /></p>